Here is a critical review of Google's Chromebook. I call it critical because the reviewer dwells more on the bad and the ugly of Chromebook. And he also works for Microsoft ;-).
Stefan's review of Google Chromebook seems quite honest considering he owns one. These are the main points he puts forth in his review.

The Good Aspects of Chromebook

Hardware - Very good quality.

Very fast resume and start.

Large trackpad that supports Multitouch.

The Bad Aspects of Chromebook

Chrome OS updates - somewhat similar to Microsoft service packs - took a long time to download.

Underpowered unit - Lag time is huge when surfing the web using 3G and WiFi.